On Thu, Jul 18, 2024 at 09:51:39AM +0800, Huan Yang wrote: > Yes, actually, if dma-buf want's to copy_file_range from a file, it need > change something in vfs_copy_file_range: No, it doesn't. copy_file_range is specifically designed to copy inside a single file system as already mentioned. The generic offload for copying between arbitrary FDs is splice and the sendfile convenience wrapper around it
